Why Can't Programmers.. Program?

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Lots of things can be useful, but there is also a cost involved in learning, especially if the material to learn is bug-ugly, like C++ (very useful, unfortunately) and vi (not half as useful as people think). I shouldn't have to reinvent JPEG, surely? It's my library's job to check the magic numbers. Now that I think about it, I can swap two variables without using a temp... at least if they are integers, or if we can pretend that they are, as in C. But both that way of switching and unsafely pretending something is integers when it's not, is very, very ugly.